Is 1287 is a composite number or not ?
- As we already know that, the number having factors 1 and the number itself is the prime number.
- And numbers having more than these two factors are the composite numbers.
- To check whether the number 1287 is composite or not first we have to find its factors.
Contents
Factors of 1287:
- If we have taken numbers from 1, 2, 3…for checking factors of 1287, we found that 1287 has factors 1, 3, 9, 11, 13, 33, 39, 99, 117, 143, 429 and 1287. Hence, we must say that 1287 is a composite number.
- Thus, 1287 is the composite number.
- If we multiply 1287 by 1, 2, 3 then we get the multiples of 1287 which are 1287, 2574 and so on.
1287 is a Composite number or Prime number
About the number 1287:
- 1287 has more than two factors which are 1, 3, 9, 11, 13, 33, 39, 99, 117, 143, 429 and 1287 and hence it is the composite number.
- 1287 is the odd composite number and it is not the perfect square also.
- If we divide 1287 by 1, 3, 9, 11, 13, 33, 39, 99, 117, 143, 429 and 1287 then we get remainder as zero. Hence, 1, 3, 9, 11, 13, 33, 39, 99, 117, 143, 429 and 1287 are the factors of 1287
Note:
- 1287 is not the perfect square.
- Factors of 1287: 1, 3, 9, 11, 13, 33, 39, 99, 117, 143, 429 and 1287
- Prime factors of 1287: 3, 11, 13
Conclusion:
- 1287 is the composite number which has factors 1, 3, 9, 11, 13, 33, 39, 99, 117, 143, 429 and 1287.
- And hence, 1287 is not the prime number.
Multiple Choice Questions:
1) 1287 is a
a) Even number
b) Prime number
c) Composite number
d) Both a and c
Ans: c) composite number
2) The non-prime factors of a composite number 1287 are
a) 1
b) 3, 11, 13
c) 1, 9, 33, 39, 99, 117, 143, 429 and 1287
d) 1, 3, 9, 11, 13, 33, 39, 99, 117, 143, 429 and 1287
Ans: b) 1, 9, 33, 39, 99, 117, 143, 429 and 1287
3) 1287 is the odd composite number because
a) It has factors 1, 3, 9, 11, 13, 33, 39, 99, 117, 143, 429 and 1287
b) It has more than two factors
c) It is not divisible by 2
d) all
Ans: d) all